room decorator vs house decorator

room decorator and house decorator both are nouns.

Word	Noun	Adjective	Verb	Adverb
room decorator	Yes	No	No	No
house decorator	Yes	No	No	No

As nouns, room decorator and house decorator are synonyms defined as:

room decorator and house decorator: a person who specializes in interior decoration

Other synonyms of room decorator include decorator, interior decorator.

room decorator (noun)	house decorator (noun)
a person who specializes in interior decoration	a person who specializes in interior decoration